you can set the PHP include_path in your .htaccess file to put the config.php file where ever you need. Then you won't get path errors. I have done this so long I probably forgot to mention it, it's so convienient when working with inc'd files (because of the DUMB way that PHP remembers the path to inc'd files that breaks paths if you try to go to different branches in a directory tree) you'll never go back. Do a google search for it or try php.net, it's a simple process.

Paul